.index-header{
    width:100%;
    height:400px;
}
.icon{
    line-height:250%l;
    vertical-align: middle;
    margin-right:100px;
    color:rgb(0,0,0,0.6);
}
.container{
    width:90%;
    left:0;
    right:0;
    margin:auto;
    height: 100px;
    padding-top: 20px;
}
.nav-link-group{
    left:0;
    right:0;
    margin:auto;
    vertical-align:top;
    list-style:none;
    list-style-type:none;
    display:inline-block;
}

.nav-link-group li{
    list-style-type:none;
    list-style:none;
    float:left;
    width:120px;
    text-align:center;
}
.nav-link-group li a {
    text-decoration: none;
    color: rgb(0, 0, 0, 0.6);
}
.login-block {
    float: right;
    line-height: 250%;
  }
  
  .login-block a {
    text-decoration: none;
    color: rgb(0, 0, 0, 0.6);
  }
.paragraph {
    width: 100%;
    /* height: 400px; */
    padding: 20px;
}
.bg-grey {
    background-color: #e3e3e3;
}
.subject-title{
    padding:15px 20px 15px 55px;
    background: #fff;
    line-height: 1.5;
    font-size:16px;
    border-bottom:1px solid #eee;
    border-radius:3px;
}
.subject-main{
    background:#FFF;
    padding:20px;
}
.subject-content{
    position:relative;
    margin-bottom:20px;
}
.subject-question{
    padding:10px 20px 10px 30px;
    background: #fff;
    line-height: 1.5;
}
.subject-option{
    margin-bottom:20px;
    border:1px solid #d4d4d4;
    border-radius:2px;
    padding:12px 20px 13px;
    display:block;
    word-break: break-all;
}